Id do a strip and see before trying anything else. The other idea I had was that he is beginning to hold his wee, so doing bigger ones rather than small wees, but I'd expect that in an older child. Would you consider elimination communication?

Miosolos is as far as I remember microfiber and I am amazed that has lasted you til almost 12 months I would do two things - 1. stripwash them and 2. ad something more absorbent like hemp. Mine have both started wetting alot more around the 12 month mark so maybe its just that.

Do you normally wash with liquid? I wonder if that didn't help as appparently it does coat the fibres more than powder.

I agree with the others too - a strip wash and add in some decent boosters at this stage. Let us know how it goes @Incywincyspider And I'm so sorry I missed your post - yes I've been out in the garden enjoying the sun (maybe too much )!